Improvement in furnaces



3 Sheets-Sheet I.

M. G. FAGAN.

FURNACE.

Patented March 2.1876.

lINVIQNMR.

N. PETERS, PHOTKHJTNOGRAFHER, WASHINGYON. D C.

WITNE 8519s.

@ I v 071/p l 3 Sheets--Sheet 2. M. G. FAGAN.

FURNACE. No. 175,059. Patented mmh 21,1876.

V FIGL.

WImNEss-msf INVENT 0R.

KFETERS, PIIQTU-UTHDGMPNEH. WASHINGTON. D C

3 Sheets-Sheet, M. G. FAGAN.

F'UNACE. No.175,059. Patented March 21,1876.

E E E l 1 1 J H Wl E! WITNESSES: INvENTon.

UNI'IED STATES Prrrisnvu4 OFFICE.

MICHEL G. FAGAN, OF TROY, NEW YORK.

` 'IMPROVEMENT IN FURNACES.

Specification forming part of Letters Patent No. 175,059, dated March21, 1876; application filed May 5, 1875.

To all whom it may concern:

Be it known that I, MICHEL G. FAGAN, of Troy, in the county ofRensselaer and in the State of New York, have invented certain new anduseful Improvements in Revertible-Flue Furnaces; and do hereby decla-rethat the following is a full, clear, and exact description thereof,reference being had to the accompanyin g drawings, making a part of thisspecifxcation, in which- Figure liis a perspective view of my furnacewith the casing removed. Fig. 2 is a vertical central section of thesame upon line w m of Fig. l, which` passes from front to rear, and Fig.3 is a like view upon line y y of said Fig. l.

Letters of like name and Ikind refer to like parts in each of thefigures.

The design of my invention is to increase the durability and improve theoperation of a revertible-lue furnace; and it consists principally in adetachable fire-pot, connected with a furnace in such manner as toenable it to expand and contract vertically under the influence of heat,wit-hout interference with or change of the relative positions of otherportions of said furnace, substantially as and for the purposehereinafter specified. It consists, further, in a revertible-iluefurnace having descending fiues which decrease in transverse dimensionsfrom their upper to their lower ends, substantially as and for thepurpose hereinafter shown. It consists, further, in a revertible-uefurnace having ascending or return flues which pass through the combustion-chamber, substantially as and for the purpose hereinafter setforth. It consists, further, in the combination of the crossflues withthe dome-plate, substantially as and for the purpose hereinafter shownand described.

'In the annexed drawings, A represents the base-plate of my furnace,upon which is an ash-pit, B, of usual form, and around the sides andvrear of said ash-pit is placed a bottom-flue, U, which is, preferably,formed upon a circular line.

Upon the ash-pit B is placed a irepot, D, and above .the latter a drum,E, which forms the combustion-chamber, and is supported by means of duesF F, &c., which extend between the lower side of the same, near itsouter edge, and the bottom flue C.

The nues Fand F convey the heated gases of combustion from thecombustionchamber to the bottom Hue, and have regularly-de` creasingdimensions from their upper to their lower ends, by which means thevelocity of the current of said gases is rendered uniform, such decreasein the transverse area of said downward dues being equal to the lessenedAvolume of said gases caused by the loss of heat as they recede from theincandescent fuel.

At a suitable poi-nt upon each side of the furnace, and, preferably, inrear of its center, is provided a return or ascending flue, G, whichextends from the bottom flue 0 vertically upward through thecombustion-chamber E and terminates at the upper side ofthe same withina crossue, H.

The ascending flue G is paralleland has transverse dimensions nearlyequal to the combined areas of the lower ends of the descending flues Fand F upon its side of the heater, so as to afford free upward passagefor the heated gases, which, through said flues, reach the bottom flue(l.

By the passage of the ue G through the com bustion-chamber E, the-gaseswithin such portion of said flue have their temperature increased and,by expansion, are caused to ascend with much greater velocity than wouldbe the case were said pipes exposed to the chilling currents of airaround the heater, such arrangement giving a strong and uniform draft.

The crossflue H is formed upon the upper side ofthe dome-plate E', andextends from the upper end of the return-flue G inward to the centerofsaid plate, where it unites with a like flue from the opposite side, andopens upward into an exit-fine, I, and downward through a damperedopening, E, into the combustionchamber E.

The location of the cross-dues H and H causes the gases passing throughthe same to retain their temperature, and prevents their velocity frombecoming checked.

The fire-pot D rests upon the upper side of the ash-pit B, and has itslower end contained within, or caused to embrace, an upwardly-projectingflange, b, as may be desired. The upper end of said tire-pot fits withina corresponding opening in the lower side of the drum E, and has,preferably, an outwardlyprojecting ange, d, which extends beyond saidopening and prevents the downward passage of dust and ashes.

As thus arranged, it will be seen that the vertical expansion andcontraction of the firepot in no manner affect the relative positionsot' the contiguous portions of the furnace, such changes of' position ofsaid parts being entirely independent.

I am aware of the patent of Gardner Chilson, No. 11,718, of September26, 1854, in which are shown ascending flues that decrease in transversedimensions'from their lower to their upper ends, and hereby disclaimsuch construction.

Having thus fully set forth the nature and merits of my invention, whatI claim as new 1s- 1. In a heatingfurnace, the combination, with' theash-pit B, combustion-chamber E, and with the inclosed air-heating spacebetween said parts, of the nre-pot D, which is supported by saidash-pit, and has its lower end contained within the vertical annularange b and at its upper end projects through the lower plate of saidcombustion-chamber, and is provided with an outwardly-projecting ange,d, substantially as and for the purpose specied.

2. In combination with the combustionchamberE and with the bottom flueC, descending nes F and F, which extend between the same, and decreasein transverse dimensions from their upper to their lower ends,substantially as and for the purpose shown.

3. In combination with the combustionchamber E of a revertible-uefurnace, an ascending ne, G, which passes upward through said chamber,substantially as and for the pur pose set forth.

4. In combination with the combustionchamber E, return-lines G and G,and exit-Hue I, the cross-fines H and H formed upon the dome-plate E',and furnishing communication between said parts, substantially as andfor the purpose shown and described.

In testimony that I claim the foregoing I have hereunto set my hand this26th day of April, 1875.

MICHEL G. FAGAN. Witnesses:

A. R. MOORE,

AUG. P. CORSE.

